Well. I guess I have a strange (uncommon at least?) form of psychopathic personality. I'm extremely manipulate(to be fair human nature is to look out for oneself in the least.) Say/Become anything to achieve the desired results in getting what I want from others. I also tend to be reflective on everything I do. I hold grudges indefinitely. I have a superb memory for the visual and auditory. I cannot see the patterns in things however (Mathematic formulas and the like, I cannot make heads or tails of.) and only understand well, things that have set rules (Biology, Languages, these are things I can understand very well). Now the flip side, the strange side to being a manipulative bastard. I have empathy, but only to people I know really well. The more I get to know someone. (Like really know them. Dark secrets, fears, etc.) The more guilt I feel in manipulating them. But I still do it. Self-destructive I guess. I have friendships, with an extremely small amount of people. I am a bit of a 'Me Monster' to those who know me.
On to the point of all that self-awareness. (I've slowly been breaking the manipulative nature, but it is a hard thing, to change your own personality) I guess I would have the power to have people do whatever I tell them to. But the more I do so, the less they would do for themselves. I would end up having to tell them to keep themselves alive. So I get what I want at the price of maintaining anyone I manipulated more than once. Powerful guilt would keep me from letting them die.
I would very much not want that power. I suppose it would be keen if I didn't give a flying fuck. Alas, I do.